Grinding or polishing machine.



W. V. ROBINSON. GRINDING 0R POLISHINQMAOHINB.

APPLIUATION FILED MAY 31, 1913. I 1,1 14,809. Patented Oct. 27,'1914.

2 SHEETS-SHEET 1.

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A 227/5 601/ Wl fam 74- a www W. V. ROBINSON. GRINDING 0R POLISHINGMACHINE.

APPLICATION FILED MAY 31,1913.

Patented Oct. 27,' 1914.

2 SHEETS-SHEET 2.

WILLIAM V. ROBINSON, OF DETROIT, MICHIGAN.

GRINDING R POLISHING MACHIN.

Specication of Letters Patent.

4Patented oct. 27, 191i.

Application led May 31. 1913. Serial No. 770,969.

`reference being had therein to t-he accompanying drawings.

My invention relates to grinding or pol ishing machines. I

The invention resides in the novel means for effecting a proper,relative movement between the grinder or polisher and the article to beoperated on; in the means for effecting an automatic, relativeadjustment between the work and the grinder or polisher; in theproducing of a structure in which the grinder or polisher is driven at auniform speed and also the relative movement between the grinder orpolisher and the Work is uniform; in the relation and construction ofthe traveling; carriage and frame; in a device for retaining the work inproper relation to the grinder and in a means for avoiding over grindingof the edges or extremities of the work; further in certainconstructions, arrangements and combinations ot' parts as will morefully hereinafter appear.

In order that the invention may be better understood I Will show anddescribe the same as embodied in a machine ot the tvpe l parts, though Ido not desire to limit niv i protection to the particular device illus`t'ated.

In the drawings,lt`igure l is u perspective View of the machineeinliodving niv in vention; Fig. 2 is a side elevation thereot; and Fig.3 is an end elevation. litiga. ll and 5 are views at right anglesillustrating the work container; Figs. t3, T and o illustrahi certaindetails of construction; and liig. l) in section 1 latter and the tramet) are preferablyT formed i of angle iron. The .sides l@ ol the 'trame(l i form tracks i'or the wheels l oi the carriage G which is adz'iptedto support the Work. The members t) and (l are mounted for travel atright angles to each other and the work' therefore, 1s mounted to bemoved longitudinally upon the traveling of one of the carriages, and tomove laterally upon the actuation of the other carriage.

H is a, grinder positioned in operative relation to the work-support G,and as the work in the device illustrated is adjusted in relation to thegrinder by the actuation of the carriages, the grinder is heldstationary, as far as lateral and longitudinal movement is concerned.

The frame C is reciprocated backward and forward upon the track B andthis reciprocation is continuous and the reversing ell'ectedautomatically. Thus, mounted in a suitable bearing I in the main frameis a shaft J driven through the medium of a pulley K. Sccurcd to theshaft J is a sprocket L which is connected bv means of a chain M with asecond sprocket N carried upon a shaft O that is mounted in a suitablehearing as I on the main iframe. The bearings I and l are fixed inrelation to the main frame and the shaftv l is continuously driven.

Q is a member depending from thc frame` C and provided with anelongated. verti cally-arrunged` Islot li within which is positioned aprojerticn or pin t5 attached to the chain )if liv this arrangement,when the pin ti is passing intermediate the sprorkets and below thesame, the l'rame C will be moved in one direction, and when the pinpasses between the sprockets at the top thereof. the traine will bemoved in the opposite direction. "lhc pin is ofcourse, so arranged tofreely pass around the proeiiets, and tlul slot lt will allow the pin topass from beneath the sprockets to there- During the longitudinalrimiprocation of the trame C the Polisher or grinder will operate uponthe work longitudinally thereol. 'l`hcretore, when the, work reaches thelimit ol its longitudinal travel, the carriage (i is moved a givendistance laterally, and preferably this lateral shifting of the carriage (i is accomplished at both limitsl of the longitudinal travel ofthe iframe C. AS shown, the n'iemhcr (s has secured to the bottom 'tarethercol a rari: 'l provided with two series ol teeth ll V, adapted to beengagi-lbv a dog IV pivoted at X to a support Y on the trame (l.Suitably connected to the carriage (i .is a cable A adapted to be woundupon a drum B iixed to a shaft C in the frame C.

D is a second cable xedly connected to the shaft C and having a weight Etending to lrotate the shaft in a direction to wind up the cable A andmove the worksupport G toward the shaft C. However, when the dog N is inengagement with the teeth -on the rack-bar, it will hold the carriage Gagainst actuation through the medium of the cable A. The dog W isactuated in one direction when the frame C reaches the inward limit ofits movement, and in the opposite direction when this frame is at itsoutward limit, and the teeth U and V are arranged in alternate relationso that the movement of the dog will release the same from itsengagement with one of the series of teeth or racks and permit thecarriage G t0 be moved laterally by the cable A a slight distance beforethe dog engages with the teeth on the other rack. By spacing the teethon the rack, any suitable lateral .movement of the carriage C may beprovided.

Preferably the dog W is actuated through the medium of a sliding rod Ghaving its inner end pivotally connected at H to the dog W and havingits outer end carrying a downwardlyextending arm I which 'is adapted toengage a trip J when the frame C reaches its outward limit of movement,

and to contact with a second trip K at the inward limit ofthe frame (1.The trips J and K are so arranged that they will engage the arm lslightly in advance of the limit of travel of the carriage G, so as toarrest movement of the rod G" before the limit of movement of thecarriage is reached, thereby causing-.a shifting of the dog. relative tothe racks, as the carriage continues to its limit of travel.

The grinder or polisher H is herein shown as of circular form and ismounted upon a shalt L carried bv a frame M ivotallv secured to a shaftN', journaled in supports or standards O in the main frame. The shalt li1s driven from the shaft N through the medium of pulleys P Q," and beltR.

The shaft N forms the main drive shaft.

and the shaft J is'actuatcd therefrom by step-down drive trains Rl 't5and a drive train R, as will be readily apparent upon reference to Fig.2. The frame lvl is connected to the outer end of a member S which isfulcrumed intermediate its ends upon a suitable support T on the mainframe, and has its other end4 attachedto a' counter-weight U, thecounterweights serving to olf-set to the desired degree the weight ofthe grinder or polisher.

lt is desirable to provide means for raising the grinder'out ofengagement with the work. and I therefore, attach the frame lV by meansof a connection 2V to a lever W.

This lever is fulcrumed at X to a support Y on the main frame and theouter end of this lever engages an elongated eye Z in a rod A2 attachedto the main frame. The eye Z, as will be apparent upon reference to Fig.3, will permit movement of the lever W in a direction to raise the frameM. but

this loop is so arranged that it will limit,

the upward movement of the outer end of the lever W `and therefore,`limit the movement of the grinder or polisher toward the work. rlhegrinder or polisher is however, free to raise. Tov allow of adjustingthe distance of the grinder from the carriage G the connection V ispreferably provided with a suitable turn-buckle C2. D? D4 arecooperating catches for holding the lever W in its adjusted positionwhen it-has been moved to raise the frame M.

In the operation of the device heretofore described, the work is placedupon the carriage G andthe latter movedvto the outward limit of itslateral movement, or away from the shaft Cthe dog lV engaging therackbar and preventing return of the support G. The frame C is thenarranged at one limit of its longitudinal reciprocation and powerapplied to the shaft R, which will drive the grinder or polisher andalso actuate the chain M. During the travel of the frame C along thetrack B a longitudinal strip of the work will be polished equal to thewidth of the work surface of the member H. Then the frame C reaches thelimit of its movement the carriage G will be shifted laterally andduring the travel of the frame (l in the opposite direction the member Hwill polish another longitudinal strip. The lateral shifting of thecarriage G is of course, so proportioned that all parts of the surfaceof the work. will be acted upon by the grinder or polisher. Furthermoreit is to be noted that the grinder is driven at a constant rate of speedand that all parts of the work are acted upon by the grinder or polisherfor the same length of time. This insures uniform grinding of thesurface being worked upon.

ln polishing or grinding certain articles, particularly where there aremovable parts, l find it desirable to provide means forA retaining thework in desired relation to the table. This is especially so in grindingor polishing stove tops where the lids are in place. rPhe retainer maybe of various constructions but in Fig. '1,1 have illustrated a deviceof novel construction and which is particularly adapted for thispurpose. Thus D2 is a stove top having the usual lids, E2 and F? is the.retaining member, in the form of a carriage G2 provided at opposite endswith rollers H2 adapted to engage the work and having their axes atright angles `lo the tfavel of the carriage G upon the frame C.Theretainer F2 is attached to a tures N2 in the cross-bar.

Vmember I2 extending transversely of the carriage G and spaced from theupper face thereof.

J2 K2 are supports iixedly connected t', the traveling frame C atopposite en'ds thereof and to the upper ends of which the member I2 isattached. The carriage G2 is so connected to the member I2 as to beyieldinglyheld in engagement with the Work. This is preferablyaccomplished by attaching the member G2 to the cross-bar or member I2 bymeans of headed bolts L2 M2 lixedly secured to the member I2 and havingtheir upper ends slidably engaging aper- This allows thev carriage G2 tomove vertically, and the apertures N2 are of sufficient size to permitthe carriage to have a slight longitudinal tilting. O2 is a leaf-springserving to yieldably press the member (lf2-downward, or in a directionto engage the Work. One end ot this spring is connected to the bottomface ot' the cross-bar I2 as by means of rivets P2,

and the opposite end lrests .upon the top of the member G2 and isslotted at Q2 R2 to receive the bolts L2 M2. Preferably two of theseretainers are employed, and the cross-bars carrying the same arearranged upon opposite sides of but in, proximity to the grinder orpolisher H land therefore, the work is yieldably held in engagement withthe inember G at points upon opposite sides of the grinder, preventingaccidental tilting ot the Work during the grinding or polishingoperation.

' When the Wheel H reaches the edges of the Work, if the edge travelsbeyond the vertical plane4 passing through the center of the wheel, thelatter will drop down a slight distance, sufficient ,to grind oit theedge as a. 'lo avoid this, means is provided which will prevent themember H from dropping over the edges. Preferably this is accomplishedby arranging guards Z c at the opposite limits of longitudinal travel ofthe Wheel H in relation to the Work-support and attaching to thecarriage M a shoe d having inclined or cam laces e f adapted to engagerespectively the guards b c. The latter are formed of members eachhaving one end attaclied to one of the sides E of the carriage C andhaving its upper end terminating in a laterally-extending flange g. Inorder to properly adjust the shoe d in relation to the work upon thesupport, the shoe is adjustably connected to the frame M as by means ofscrews 7L engaging elongated slots z' in the shoe. By the arrangementjust described, when the member H reachesJ the edge a, the portion cwill engage the flange g Vand prevent the grinder from dropping down.Similarly vvlien the grinder reaches the inner edge of theworktheportion f Will engage the memberc. The member D is of course, soadjusted that .when the portions e f are in engagement with the `flangesgA to engage the latter slightly in advance of` the limit ofrccipi'ocation of said carriage.

2. In a grinder or polislier, the combination with a frame, of acarriage arranged thereon for reciprocation, a support mounted on saidcarriage, means tending to move said support .in 'one direction, meansfor effecting a step-by-step movement of the support in said direction,4an operating member for said means arranged upon said carriage, andtrips acting-upon said operating member at the opposite limits ofreciprocatien of said carriage.

3. -In a grinder or polisher,`tlie combina-V tion with a support, an"operating member positioned in operative relation to the support, alever, a connection between said lever and said frame, and means cooperating with said member to limit the Irevenient of the member toward thesupport.

.4. In a grinder or polislier, the combination with a work-support, anoperatingv Inember positioned in operative relation to the support, andmeans iiidepend ent of the work support positioned in proximity to saidoperating member for preventing accidental movement of the Work relativethereto. i

5. In a grinder or polislier, the combination with a Work-support, anoperating member positioned in operative relation to lthe support, andmeans extending over the carriage, and means connected to said crossbarfor exerting a yielding pressure upon the work.

7. In a grinder or iolisher, the combination wvith a support, oi acarriage over which soA said support is adapted to move, an operatingmember positioned in operative relation tothe support, cross-barscarried by the car-.

riage and arranged upon opposite sides of the work-operating member andin proX- imity to the path of movement thereof, and yielding meanscarried by said cross-bars for exerting a pressure upon the Work.

8. In a grinder or polisher, the combination with a support,of acarriage over which said support is adapted to move, an operating memberpositioned`in operative relation to the support, members .extending ap-Wardly from the carriage at opposite ends of the support, a cross-barconnecting said members, a roll connected to said cross-bar for verticalplay, and a spring attached to the cross-bar and adapted to exert apressure on said roll in the direction of the support.

9. In a grinder or polisher, the combination With a work-support, of amember for operating upon the Work adapted to move toward the carriage,means for reciprocating the carriage, and means forlimiting the movementof said'member toward the Work at a predetermined point in the travel ofsaid carriage.

10. In a grinder or polisher, the combination with a Work-support, of amember for operating lupon the Work adapted to move toward the'carriage,means for reciprocating the carriage, and means for limiting themovement of said member toward the Work at one limit of reciprocation ofsaid carriage.

11. In a grinder or polisher, the combinationwvith a work-support, of amember for operating upon the Work adapted to move toward the carriage,means for reciprocating the carriage, and means for limiting themovement of said member toward the Work at the opposite limits ofreciprocation of vsaid carriage.

12. In a grinder or polisher, the combination with a reciprocatingvcarriage, of a member for operating upon the Work on the carriage,adapted to move toward the carriage, a guard arranged at one end of thecarriage, and a shoe operatively attached to said member for engagingsaid guard at a predetermined point in the travel of said carriage'.

13. In a grinder or polisher, the combination with a reciprocatingcarriage, of a frame adapted to rock toward the Work, a Work-operatingmember carried by said frame, guards arranged at opposite ends of.

tion with a Work support of means independent of the Work support foryieldably pressing the Work toward the support.

15. In a grinder or polisher, the combination with the Work support of atraveling carriage for carrying said Work support, and means on saidcarriage for yieldably pressing the Word toward the support.

16. .In a grinder or polisher, the combination with a support, anoperating member positioned in operative relation to the support, alever, a rod attached to said frame, and coperating catches respectivelyon said rod and lever to limit the movement of the member toward thesupport.

17. In a 'grinder or polisher, the combination with a reciprocatingcarriage, of a transversely-moving Work-support, a member for operatingupon the work, and means for limiting the transverse movement of saidWork-support at a predetermined point in the travel of said carriage. L

18. In a grinder or polisher, the combination with a reciprocatingcarriage, of a transversely-moving Work-support, a mem-v ber foroperating upon the work, a lever, an adjustable connection between said`lever and said support, and meansl coperatmg With said carriage tolimit the transverse move` ment of the support. I 1

19. In a grinder or polisher, the combina-I tion with a frame having atrack, a carriage having Wheels mounted thereon, said carriage beingprovided With a track at substantially right angles to thefirst-mentioned track, a Work-support having Wheels mounted upon saidcarriage track, automatic means for continuously reciprocating saidcarriage, and means for automatically effecting a step-byLstep movementof the support at each stroke.

In testimony whereof I aflix my signature in presence of tWo Witnesses.

VILLIAM V. ROBINSON. "Witnesses:

IVM. J. BELKNAP, JAMES P. BARRY.'

soi

